EP2887344B1 - Touch control display driving circuit, driving method thereof and display device - Google Patents
Touch control display driving circuit, driving method thereof and display device Download PDFInfo
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- EP2887344B1 EP2887344B1 EP13854233.7A EP13854233A EP2887344B1 EP 2887344 B1 EP2887344 B1 EP 2887344B1 EP 13854233 A EP13854233 A EP 13854233A EP 2887344 B1 EP2887344 B1 EP 2887344B1
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- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Definitions
- the present invention relates to the field of display technology, and particularly relates to a touch display drive circuit, a touch display drive method and a display device.
- AMOLED Active matrix organic light emitting diode
- TFT-LCDs thin film transistor-liquid crystal displays
- OLEDs have the advantages of low power consumption, low production cost, self-luminous property, wide viewing angle, fast response speed and the like.
- the OLEDs start to replace the traditional LCD (liquid crystal display) screens in the display fields of mobile phones, PDAs, digital cameras and the like.
- Pixel drive circuit design is the core technical content of the AMOLED displays and has important research significance.
- the existing display devices with a touch function may be generally divided into two types: on cell touch panels and in cell touch panels.
- the in cell touch panels are smaller in thickness and higher in light transmissivity, thus being capable of providing applications with better performances.
- in cell touch technology can be integrated with AMOLEDs, that is, a Touch manufacture procedure is integrated with an Array manufacture procedure, then the integration level of an in cell touch circuit and an AMOLED drive circuit may be improved, and the production cost may be reduced simultaneously.
- CN103246396 describes a touch display circuit structure and a driving method thereof, an array substrate and a display device, and relates to the field of display manufacture.
- US 2005/200293 A1 describes an emissive pixel display device, whereby photon sensors are disposed within pixels and operated to sense photons emitted by emitter within pixel and ambient photons emitted by sources outside pixel, sensed internally emitted photons being for luminance feedback control and sensed ambient photons being used to detect external light source or sources.
- the present invention provides a touch display drive circuit as defined in claim 1.
- the invention also provides a method of driving for a touch display drive circuit as defined in claim 4.
- the technical solution of the present invention may reduce production processes for touch display products during production, save cost, and increasee aperture opening ratio of the products simultaneously, thus increasing additional value.
- Fig. 1 is a structural schematic diagram of a touch display drive circuit provided by an embodiment of the present invention, as shown in Fig. 1 , the touch display drive circuit comprises: a touch module and a display drive module comprising a drive unit and a light emitting unit.
- the display drive module is connected with a data line, a first scanning line, a second scanning line, a control line, a first voltage source, a third voltage source and a fourth voltage source.
- the display drive module under the control of signals input from the data line, the first scanning line and the second scanning line, is used for compensating the drive unit, writing a data signal input from the data line outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light.
- the touch module is connected with the first scanning line, the second scanning line, a reading line and a second voltage source.
- the touch module under the action of the signals input from the first scanning line and the second scanning line, is used for receiving the data signal input from the display drive module to reset the touch module, and when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal.
- the display drive module further comprises: a data writing unit, a drive compensation unit, a voltage stabilizing unit and a light emitting control unit; wherein the data writing unit is used for writing a data voltage provided by the data line into the drive compensation unit under the action of the signal input from the first scanning line; the voltage-stabilizing unit is used for stabilizing the voltage of the drive compensation unit under the action of the control signal input from the control line; the drive compensation unit is used for performing discharge compensation on the threshold voltage of the drive unit under the action of the signal input from the first scanning line; and the light emitting unit is used for emitting light under the drive of the drive unit and the light emitting control unit.
- the data writing unit is used for writing a data voltage provided by the data line into the drive compensation unit under the action of the signal input from the first scanning line
- the voltage-stabilizing unit is used for stabilizing the voltage of the drive compensation unit under the action of the control signal input from the control line
- the drive compensation unit is used for performing discharge compensation on the threshold voltage of the drive unit under the action of the signal
- the data writing unit comprises a sixth switch T6, the drive compensation unit comprises a second capacitor C2, a fifth switch T5 and a seventh switch T7, the drive unit comprises a drive transistor T9, the voltage-stabilizing unit comprises an eighth switch T8, the light emitting control unit comprises a fourth switch T4, and the light emitting unit comprises a light emitting diode; wherein the gate electrode of the fourth switch T4 is connected with the second scanning line, the first electrode of the fourth switch T4 is connected with the second electrode of the eighth switch T8 and the first voltage source, and the second electrode of the fourth switch T4 is connected with the second electrode of the fifth switch T5 and the first electrode of the drive transistor T9; the gate electrode of the fifth switch T5 is connected with the gate of the sixth switch T6 and the first scanning line, the first electrode of the fifth switch T5 is connected with the first end of the second capacitor C2 and the gate electrode of the drive transistor T9, and the second electrode of the fifth switch T5 is connected with the first electrode of the drive transistor T9; the gate electrode of
- the touch module comprises: a signal input unit and a touch sensing unit connected with the signal input unit, the signal input unit is used for writing a voltage signal input from the data line into the touch sensing unit under the control of the signal input from the second scanning line, and the touch sensing unit is used for providing a touch signal for the reading line when touch occurs.
- the signal input unit comprises a first switch T1
- the touch sensing unit comprises a first capacitor C1, a second switch T2 and the third switch T3
- the gate electrode of the first switch T1 is connected with the second scanning line
- the first electrode of the first switch T1 is connected with the drive compensation unit
- the second electrode of the first switch T1 is connected with the touch electrode
- the gate electrode of the second switch T2 is connected with the touch electrode
- the first electrode of the second switch T2 is connected with the first electrode of the third switch T3
- the second electrode of the second switch T2 is connected with the second end of the first capacitor C1 and the second voltage source
- the gate electrode of the third switch T3 is connected with the first scanning line and the drive compensation unit
- the second electrode of the third switch T3 is connected with the reading line
- the first end of the first capacitor C1 is connected with the second electrode of the first switch T1 and the gate electrode of the second switch T2, and the second end of the first capacitor C1 is connected with the second voltage source.
- the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the eighth switch T8 and the drive transistor T9 are N-type thin film transistors, and the second switch T2 is an amplifying transistor.
- the first electrode and the second electrode in each of the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the eighth switch T8 and the drive transistor T9 serve as a source electrode and a drain electrode.
- the first electrodes and the second electrodes in the switches are identical in structure. In actual application, for one switch, according to its position and function, its first electrode may serve as the source electrode, and correspondingly, its second electrode serves as the drain electrode; or, its first electrode may serve as the drain electrode, and correspondingly, its second electrode serves as the source electrode.
- the N-type transistor adopted in the embodiment of the present invention is turned on when its gate electrode is high-level and turned off when its gate electrode is low-level, and the second switch T2 is an amplifying transistor and capable of amplifying the touch signal, thus improving the detection sensitivity of the touch signal.
- Fig. 2 is a state schematic diagram of the signal timing sequence of a touch display drive circuit in the embodiment.
- the first stage is a stage for touch module resetting, display signal resetting and initialization signal acquisition
- the second stage is a stage for touch signal acquisition and display discharge compensation
- the third stage is a stage for touch signal standstill and display hop buffering
- the fourth stage is a stage for touch standstill and display light emitting
- a high-level Vdd signal is input from the first voltage source
- a common voltage Vcom signal is input from the second voltage source
- low-level signals Vss are input from the third voltage source and the fourth voltage source
- a Vdata signal is input from the data line.
- Fig. 3 is an equivalent circuit schematic diagram of a touch display drive circuit in the embodiment in the first stage.
- a high-level signal is applied to the first scanning line
- a high level is applied to the second scanning line
- a low level is applied to the control line
- a low level is applied to the data line.
- the first switch T1, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned on
- the eighth switch T8 is turned off.
- the voltage Vd received by the touch electrode D from the data line is equal to Vdata
- the voltage Vb received by the second end B of the second capacitor C2 from the data line is equal to Vdata
- the second switch T2 may serve as an amplifying transistor for amplifying a current signal
- the first electrode of the second switch T2 is connected with the second voltage source, which provides a low-level voltage.
- the second switch T2 is turned on to amplify the current signal
- the third switch T3 is turned on, and the reading line receives an initial reference current signal.
- the first voltage source charges the first end A of the second capacitor C2 to Vdd, that is, Va is equal to Vdd.
- Fig. 4 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the second stage.
- a high-level signal is applied to the first scanning line
- a high level is applied to the second scanning line
- a low level is applied to the control line
- a low level is applied to the data line.
- the first switch T1 and the eighth switch T8 are turned off, and the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned on.
- the voltage of the gate electrode of the second switch T2 connected with the touch electrode D is reduced to Vdata-Vf, at this moment, the absolute value of the gate-to-source voltage of the second switch T2 serving as the amplifying transistor is greater than the threshold voltage Vth for turning on the second switch, that is, IVdata-Vfl > Vth. Accordingly, the second switch T2 is turned on, the generated touch current flows through the third electrode of the third switch T3, the reading line receives the touch current signal, and the touch current signal at this moment is less than the initial reference current signal in the first stage when touch does not occur.
- the size of the touch electrode D depends on the manufacturing process of the amplifying transistor T2. Fig.
- FIG. 5 is a voltage change schematic diagram of a touch electrode in the touch display drive circuit in the embodiment.
- the voltage Vd of the gate electrode D is equal to Vdata before being touched and reduced to Vdata-Vf after being touched, and at this moment, the reading line receives the changed signal, thus determining the position where the touch occurs.
- the first end A of the second capacitor C2 discharges till its voltage achieves the threshold value Vthh of the drive transistor T9, and the voltage Vb of the second end of the second capacitor C2 still is Vdata. So far the processes of touch control signal acquisition and display discharge compensation are finished.
- Fig. 6 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the third stage.
- a low level is applied to the first scanning line
- a low level is applied to the second scanning line
- a high level is applied to the signal line
- a high level is applied to the data line.
- the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned off
- the eighth switch T8 is turned on
- the touch module is in a standstill stage, that is, all the devices of the touch module do not work, which may reduce influence on the light emitting display of the light emitting unit.
- Fig. 7 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the fourth stage.
- a low level is applied to the first scanning line
- a low level is applied to the second scanning line
- a high level is applied to the signal line
- a high level is applied to the data line.
- the first switch T1, the second switch T2, the third switch T3, the fifth switch T5, the sixth switch T6, the seventh switch T7 and the eighth switch T8 are turned off, and the fourth switch T4 is turned on.
- the drive current I is only related to the voltage value Vdata provided by the data line, and therefore is free from the influence of the threshold voltage Vthh of the drive transistor T9, wherein Vgs is a voltage between the gate electrode and the source electrode of the drive transistor T9, and Vc is the drain electrode potential of the drive transistor T9.
- the touch module of the touch display drive circuit under the control of the first switch T1, the second switch T2 and the third switch T3, transmits the changed voltage signal (that is, the touch signal) to the reading line, the reading line determines the touch signal in the position where touch occurs, and after determining the occurrence of the touch, the second capacitor C2 is charged, so that the voltage Vdd provided by the first voltage source and the threshold voltage Vthh of the drive transistor T9 are written into the second capacitor C2, and then the gate-to-source voltage is provided to the drive transistor T9 by the second capacitor C2 so as to compensate the threshold voltage of the drive transistor T9.
- the drive transistor T9 drives the light emitting unit to emit light for display
- the drive current flowing through the drive transistor T9 is independent of the threshold voltage Vthh of the drive transistor T9, thus preventing the drive current flowing through the light emitting unit from being influenced by non-uniformity and drift of the threshold voltage Vthh.
- the drive current flowing through the drive transistor T9 is also independent of its threshold voltage Vthh, preventing the drive current from being influenced by the rising of its threshold voltage Vthh caused by degeneration of the light emitting unit, thus improving the uniformity of the drive current flowing through the light emitting unit.
- the touch display drive circuit comprises: a touch module and a display drive module; the display drive module, under the control of signals input from a data line, a first scanning line and a second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal.
- production processes for touch display products during production may be reduced, cost is saved, and aperture opening ratio of the products may be increased simultaneously, thus increasing additional value.
- the embodiment of the present invention further provides a display device, comprising a touch display drive circuit comprising a touch module and a display drive module; the display drive module, under the control of signals input from a data line, a first scanning line and a second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal.
- production processes for touch display products during production may be reduced, cost is saved, and aperture opening ratio of the products may be increased simultaneously, thus increasing additional value.
- the OLED display device provided by the present invention belongs to current drive, and stable current is required to control light emitting. Due to the reasons of process manufacture procedures, device ageing and the like, the threshold voltages of the drive TFTs of respective pixel points are non-uniform in the most original 2T1C drive circuit, which results in the change of the OLED current flowing through each pixel point, thus influencing the display effect of the whole image. The influence due to the change of Vthh is solved by the pixel drive circuit of the present invention by means of compensation. Moreover, it is ensured that no current passes through the OLED except in the light emitting stage, thus prolonging the service life of the OLED.
- the touch technology adopts capacitive touch which is the mainstream now.
- the touch electrode is designed in each pixel, when a finger is close to the screen, the coupling capacitance of the touch electrode is changed because of the intervention of the finger, which in turn causes the change of a node potential and the intensity of the signal acquired by a terminal device is increased, thus determining the position of the touch point.
- a light-sensitive type touch sensing unit may also be adopted.
- phototransistors are provided in respective pixel regions, when a user performs a touch operation, the light receiving amounts of the phototransistors are changed due to the influence of the light shielding generated by the user during touching, the phototransistors generate different leakage currents according to different light receiving amounts, and detection of the touch position may be realized by detecting the difference among the leakage currents of the phototransistors in different pixel regions.
- integration of In Cell Touch function and pixel compensation function may be realized by only using a dual-signal channel, instead of the previous multi-signal channel, thus achieving convenient, fast and efficient working.
- the embodiment of the present invention further provides a drive method for a touch display circuit, which is based on the touch display drive circuit and comprises:
- the first stage specifically is: the sixth switch is turned on and writes a data signal into the second capacitor to charge the second capacitor under the control of a signal input from the first scanning line, the first switch is turned on and inputs the data signal to the first capacity to charge the first capacity under the control of a signal input from the second scanning line, the second switch and the third switch are turned on, and the reading line receives an initial signal.
- the second stage specifically is: the fifth switch and the seventh switch are turned on, and the second capacitor discharges and compensates the threshold voltage of the drive transistor under the control of the signal input from the first scanning line, simultaneously the touch sensing unit detects a touch signal, and the reading line receives the touch signal.
- the third stage specifically is: the eighth switch stabilizes the voltage of the third capacitor under the action of a control signal input from the control line, and at this moment, the touch sensing unit is in a standstill state.
- the fourth stage specifically is: the fourth switch is controlled to be turned on by the signal input from the second scanning line, the light emitting unit emits light under the control of the fourth switch and the drive transistor, and at this moment, the touch sensing unit is in a standstill state.
- the method is based on a touch display drive circuit comprising a touch module and a display drive module, wherein the display drive module, under the control of signals input from the data line, the first scanning line and the second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal.
- This may reduce production processes of touch display products during production, save cost, and simultaneously increase aperture opening ratio of the products, thus increasing additional value.
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Description
- The present invention relates to the field of display technology, and particularly relates to a touch display drive circuit, a touch display drive method and a display device.
- Active matrix organic light emitting diode (AMOLED) displays are one of hotspots in the field of flat-panel displays nowadays Compared with thin film transistor-liquid crystal displays (TFT-LCDs), OLEDs have the advantages of low power consumption, low production cost, self-luminous property, wide viewing angle, fast response speed and the like. At present, the OLEDs start to replace the traditional LCD (liquid crystal display) screens in the display fields of mobile phones, PDAs, digital cameras and the like. Pixel drive circuit design is the core technical content of the AMOLED displays and has important research significance.
- According to different relative positions between a touch panel and a display panel, the existing display devices with a touch function may be generally divided into two types: on cell touch panels and in cell touch panels. Compared with the on cell touch panels, the in cell touch panels are smaller in thickness and higher in light transmissivity, thus being capable of providing applications with better performances.
- If in cell touch technology can be integrated with AMOLEDs, that is, a Touch manufacture procedure is integrated with an Array manufacture procedure, then the integration level of an in cell touch circuit and an AMOLED drive circuit may be improved, and the production cost may be reduced simultaneously.
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CN103246396 describes a touch display circuit structure and a driving method thereof, an array substrate and a display device, and relates to the field of display manufacture.US 2005/200293 A1 describes an emissive pixel display device, whereby photon sensors are disposed within pixels and operated to sense photons emitted by emitter within pixel and ambient photons emitted by sources outside pixel, sensed internally emitted photons being for luminance feedback control and sensed ambient photons being used to detect external light source or sources. - The invention is defined by the features of the independent claims. Preferred embodiments are defined by the features of the dependent claims.
- The present invention provides a touch display drive circuit as defined in claim 1. The invention also provides a method of driving for a touch display drive circuit as defined in claim 4.
- The technical solution of the present invention may reduce production processes for touch display products during production, save cost, and increasee aperture opening ratio of the products simultaneously, thus increasing additional value.
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Fig. 1 is a structural schematic diagram of a touch display drive circuit provided by an embodiment of the present invention; -
Fig. 2 is a state schematic diagram of the signal timing sequence of a touch display drive circuit in the embodiment; -
Fig. 3 is an equivalent circuit schematic diagram of a touch display drive circuit in the embodiment in a first stage; -
Fig. 4 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in a second stage; -
Fig. 5 is a voltage change schematic diagram of the touch electrode in a touch display drive circuit in the embodiment; -
Fig. 6 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in a third stage; and -
Fig. 7 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in a fourth stage. - For the person skilled in the art to better understand the technical solution of the present invention, a touch display drive circuit, a touch display drive method and a display device provided by the present invention are further described below in details in conjunction with the accompanying drawings.
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Fig. 1 is a structural schematic diagram of a touch display drive circuit provided by an embodiment of the present invention, as shown inFig. 1 , the touch display drive circuit comprises: a touch module and a display drive module comprising a drive unit and a light emitting unit. - The display drive module is connected with a data line, a first scanning line, a second scanning line, a control line, a first voltage source, a third voltage source and a fourth voltage source. The display drive module, under the control of signals input from the data line, the first scanning line and the second scanning line, is used for compensating the drive unit, writing a data signal input from the data line outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light.
- The touch module is connected with the first scanning line, the second scanning line, a reading line and a second voltage source. The touch module, under the action of the signals input from the first scanning line and the second scanning line, is used for receiving the data signal input from the display drive module to reset the touch module, and when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal.
- Preferably, the display drive module further comprises: a data writing unit, a drive compensation unit, a voltage stabilizing unit and a light emitting control unit; wherein the data writing unit is used for writing a data voltage provided by the data line into the drive compensation unit under the action of the signal input from the first scanning line;
the voltage-stabilizing unit is used for stabilizing the voltage of the drive compensation unit under the action of the control signal input from the control line;
the drive compensation unit is used for performing discharge compensation on the threshold voltage of the drive unit under the action of the signal input from the first scanning line; and
the light emitting unit is used for emitting light under the drive of the drive unit and the light emitting control unit. - Specifically, the data writing unit comprises a sixth switch T6, the drive compensation unit comprises a second capacitor C2, a fifth switch T5 and a seventh switch T7, the drive unit comprises a drive transistor T9, the voltage-stabilizing unit comprises an eighth switch T8, the light emitting control unit comprises a fourth switch T4, and the light emitting unit comprises a light emitting diode; wherein
the gate electrode of the fourth switch T4 is connected with the second scanning line, the first electrode of the fourth switch T4 is connected with the second electrode of the eighth switch T8 and the first voltage source, and the second electrode of the fourth switch T4 is connected with the second electrode of the fifth switch T5 and the first electrode of the drive transistor T9;
the gate electrode of the fifth switch T5 is connected with the gate of the sixth switch T6 and the first scanning line, the first electrode of the fifth switch T5 is connected with the first end of the second capacitor C2 and the gate electrode of the drive transistor T9, and the second electrode of the fifth switch T5 is connected with the first electrode of the drive transistor T9;
the gate electrode of the sixth switch T6 is connected with the first scanning line, the first electrode of the sixth switch T6 is connected with the data line, and the second electrode of the sixth switch T6 is connected with the first electrode of the eighth switch T8, the second end of the second capacitor C2 and the first electrode of the first switch T1;
the gate electrode of the seventh switch T7 is connected with the first scanning line and the gate electrode of the third switch T3, the first electrode of the seventh switch T7 is connected with the second electrode of the drive transistor T9 and the organic light emitting diode, and the second electrode of the seventh switch T7 is connected with the third voltage source;
the gate electrode of the eighth switch T8 is connected with the control line, the first electrode of the eighth switch T8 is connected with the second end of the second capacitor C2 and the first electrode of the first switch T1, and the second electrode of the eighth switch T8 is connected with the first voltage source; and the gate electrode of the drive transistor T9 is connected with the first end of the second capacitor C2, and the second electrode of the drive transistor T9 is connected with the organic light emitting diode. - Preferably, the touch module comprises: a signal input unit and a touch sensing unit connected with the signal input unit, the signal input unit is used for writing a voltage signal input from the data line into the touch sensing unit under the control of the signal input from the second scanning line, and the touch sensing unit is used for providing a touch signal for the reading line when touch occurs.
- Specifically, the signal input unit comprises a first switch T1, and the touch sensing unit comprises a first capacitor C1, a second switch T2 and the third switch T3; wherein
the gate electrode of the first switch T1 is connected with the second scanning line,
the first electrode of the first switch T1 is connected with the drive compensation unit, and the second electrode of the first switch T1 is connected with the touch electrode;
the gate electrode of the second switch T2 is connected with the touch electrode, the first electrode of the second switch T2 is connected with the first electrode of the third switch T3, and the second electrode of the second switch T2 is connected with the second end of the first capacitor C1 and the second voltage source;
the gate electrode of the third switch T3 is connected with the first scanning line and the drive compensation unit, and the second electrode of the third switch T3 is connected with the reading line; and
the first end of the first capacitor C1 is connected with the second electrode of the first
switch T1 and the gate electrode of the second switch T2, and the second end of the first capacitor C1 is connected with the second voltage source. - Preferably, the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the eighth switch T8 and the drive transistor T9 are N-type thin film transistors, and the second switch T2 is an amplifying transistor.
- It should be noted that, in the embodiment of the present invention, the first electrode and the second electrode in each of the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the eighth switch T8 and the drive transistor T9 serve as a source electrode and a drain electrode. The first electrodes and the second electrodes in the switches are identical in structure. In actual application, for one switch, according to its position and function, its first electrode may serve as the source electrode, and correspondingly, its second electrode serves as the drain electrode; or, its first electrode may serve as the drain electrode, and correspondingly, its second electrode serves as the source electrode. The N-type transistor adopted in the embodiment of the present invention is turned on when its gate electrode is high-level and turned off when its gate electrode is low-level, and the second switch T2 is an amplifying transistor and capable of amplifying the touch signal, thus improving the detection sensitivity of the touch signal.
- The working process of the touch display drive circuit in the embodiment is described below in details in conjunction with
Figs. 2 to 7 . -
Fig. 2 is a state schematic diagram of the signal timing sequence of a touch display drive circuit in the embodiment. As shown inFig. 2 , the first stage is a stage for touch module resetting, display signal resetting and initialization signal acquisition, the second stage is a stage for touch signal acquisition and display discharge compensation, the third stage is a stage for touch signal standstill and display hop buffering, the fourth stage is a stage for touch standstill and display light emitting, a high-level Vdd signal is input from the first voltage source, a common voltage Vcom signal is input from the second voltage source, low-level signals Vss are input from the third voltage source and the fourth voltage source, and a Vdata signal is input from the data line. -
Fig. 3 is an equivalent circuit schematic diagram of a touch display drive circuit in the embodiment in the first stage. As shown inFigs. 2 and3 , in the first stage, a high-level signal is applied to the first scanning line, a high level is applied to the second scanning line, a low level is applied to the control line, and a low level is applied to the data line. At this moment, the first switch T1, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned on, and the eighth switch T8 is turned off. The voltage Vd received by the touch electrode D from the data line is equal to Vdata, the voltage Vb received by the second end B of the second capacitor C2 from the data line is equal to Vdata, the second switch T2 may serve as an amplifying transistor for amplifying a current signal, and the first electrode of the second switch T2 is connected with the second voltage source, which provides a low-level voltage. At this moment, the second switch T2 is turned on to amplify the current signal, the third switch T3 is turned on, and the reading line receives an initial reference current signal. Simultaneously, the first voltage source charges the first end A of the second capacitor C2 to Vdd, that is, Va is equal to Vdd. - So far touch module resetting, display signal resetting and initialization signal acquisition are finished.
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Fig. 4 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the second stage. As shown inFigs. 2 and4 , in the second stage, a high-level signal is applied to the first scanning line, a high level is applied to the second scanning line, a low level is applied to the control line, and a low level is applied to the data line. At this moment, the first switch T1 and the eighth switch T8 are turned off, and the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned on. When the touch electrode D is touched by a finger, the voltage of the gate electrode of the second switch T2 connected with the touch electrode D is reduced to Vdata-Vf, at this moment, the absolute value of the gate-to-source voltage of the second switch T2 serving as the amplifying transistor is greater than the threshold voltage Vth for turning on the second switch, that is, IVdata-Vfl > Vth. Accordingly, the second switch T2 is turned on, the generated touch current flows through the third electrode of the third switch T3, the reading line receives the touch current signal, and the touch current signal at this moment is less than the initial reference current signal in the first stage when touch does not occur. Herein the size of the touch electrode D depends on the manufacturing process of the amplifying transistor T2.Fig. 5 is a voltage change schematic diagram of a touch electrode in the touch display drive circuit in the embodiment. As shown inFig. 5 , the voltage Vd of the gate electrode D is equal to Vdata before being touched and reduced to Vdata-Vf after being touched, and at this moment, the reading line receives the changed signal, thus determining the position where the touch occurs. Simultaneously, the first end A of the second capacitor C2 discharges till its voltage achieves the threshold value Vthh of the drive transistor T9, and the voltage Vb of the second end of the second capacitor C2 still is Vdata. So far the processes of touch control signal acquisition and display discharge compensation are finished. -
Fig. 6 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the third stage. As shown inFigs. 2 and6 , in the third stage, a low level is applied to the first scanning line, a low level is applied to the second scanning line, a high level is applied to the signal line, and a high level is applied to the data line. At this moment, the first switch T1, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6 and the seventh switch T7 are turned off, the eighth switch T8 is turned on, and the touch module is in a standstill stage, that is, all the devices of the touch module do not work, which may reduce influence on the light emitting display of the light emitting unit. - Simultaneously, discharging of the first end A of the second capacitor C2 is finished, and a stable voltage difference Vthh-Vdata exists between the first end A and the second end B of the second capacitor. Preparations are made for the light emitting unit to perform light emitting display in this stage.
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Fig. 7 is an equivalent circuit schematic diagram of the touch display drive circuit in the embodiment in the fourth stage. As shown inFigs. 2 and7 , in the fourth stage, a low level is applied to the first scanning line, a low level is applied to the second scanning line, a high level is applied to the signal line, and a high level is applied to the data line. Accordingly, the first switch T1, the second switch T2, the third switch T3, the fifth switch T5, the sixth switch T6, the seventh switch T7 and the eighth switch T8 are turned off, and the fourth switch T4 is turned on. At this moment, the voltage Vdd provided by the first voltage source is received by the second end B of the second capacitor C2, that is, the voltage of the second end B of the second capacitor C2 is changed to Vdd from the original Vdata, that is, Vb = Vdd, the voltage of the first end A of the second capacitor C2 is floating, the first end A and the second end B of the second capacitor C2 perform an equivalent voltage jump, whereas the original stable voltage difference Vthh-Vdata is maintained between Va and Vb, and therefore, Va=Vb+Vthh-Vdata=Vdd+Vthh-Vdata. Simultaneously, the light emitting unit enters into a light emitting stage, and at this moment, the equation below may be obtained from the saturated drive current formula of the drive transistor T9: I=K[Vgs-Vthh]2=K[Vdd+Vthh-Vdata-Vc-Vthh]2=K(Vdd-Vdata-Vc)2, - From the above equation, it can be known that the drive current I is only related to the voltage value Vdata provided by the data line, and therefore is free from the influence of the threshold voltage Vthh of the drive transistor T9, wherein Vgs is a voltage between the gate electrode and the source electrode of the drive transistor T9, and Vc is the drain electrode potential of the drive transistor T9.
- In this embodiment, the touch module of the touch display drive circuit, under the control of the first switch T1, the second switch T2 and the third switch T3, transmits the changed voltage signal (that is, the touch signal) to the reading line, the reading line determines the touch signal in the position where touch occurs, and after determining the occurrence of the touch, the second capacitor C2 is charged, so that the voltage Vdd provided by the first voltage source and the threshold voltage Vthh of the drive transistor T9 are written into the second capacitor C2, and then the gate-to-source voltage is provided to the drive transistor T9 by the second capacitor C2 so as to compensate the threshold voltage of the drive transistor T9. The drive transistor T9 drives the light emitting unit to emit light for display, the drive current flowing through the drive transistor T9 is independent of the threshold voltage Vthh of the drive transistor T9, thus preventing the drive current flowing through the light emitting unit from being influenced by non-uniformity and drift of the threshold voltage Vthh. Simultaneously, the drive current flowing through the drive transistor T9 is also independent of its threshold voltage Vthh, preventing the drive current from being influenced by the rising of its threshold voltage Vthh caused by degeneration of the light emitting unit, thus improving the uniformity of the drive current flowing through the light emitting unit.
- The touch display drive circuit provided by the embodiment comprises: a touch module and a display drive module; the display drive module, under the control of signals input from a data line, a first scanning line and a second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal. According to the present invention, production processes for touch display products during production may be reduced, cost is saved, and aperture opening ratio of the products may be increased simultaneously, thus increasing additional value.
- The embodiment of the present invention further provides a display device, comprising a touch display drive circuit comprising a touch module and a display drive module; the display drive module, under the control of signals input from a data line, a first scanning line and a second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving the light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal. According to the present invention, production processes for touch display products during production may be reduced, cost is saved, and aperture opening ratio of the products may be increased simultaneously, thus increasing additional value.
- Different from that TFT-LCD displays use stable voltage to control brightness, the OLED display device provided by the present invention belongs to current drive, and stable current is required to control light emitting. Due to the reasons of process manufacture procedures, device ageing and the like, the threshold voltages of the drive TFTs of respective pixel points are non-uniform in the most original 2T1C drive circuit, which results in the change of the OLED current flowing through each pixel point, thus influencing the display effect of the whole image. The influence due to the change of Vthh is solved by the pixel drive circuit of the present invention by means of compensation. Moreover, it is ensured that no current passes through the OLED except in the light emitting stage, thus prolonging the service life of the OLED.
- The touch technology adopts capacitive touch which is the mainstream now. In the present invention, the touch electrode is designed in each pixel, when a finger is close to the screen, the coupling capacitance of the touch electrode is changed because of the intervention of the finger, which in turn causes the change of a node potential and the intensity of the signal acquired by a terminal device is increased, thus determining the position of the touch point.
- Of course, a light-sensitive type touch sensing unit may also be adopted. Herein phototransistors are provided in respective pixel regions, when a user performs a touch operation, the light receiving amounts of the phototransistors are changed due to the influence of the light shielding generated by the user during touching, the phototransistors generate different leakage currents according to different light receiving amounts, and detection of the touch position may be realized by detecting the difference among the leakage currents of the phototransistors in different pixel regions.
- In the circuit design provided by the embodiment of the present invention, integration of In Cell Touch function and pixel compensation function may be realized by only using a dual-signal channel, instead of the previous multi-signal channel, thus achieving convenient, fast and efficient working.
- Meanwhile, since the AMOLED manufacture procedure of low temperature poly-silicon (LTPS) is adopted in the present invention, this design in which a plurality of thin film transistors are combined with capacitors may not influence the aperture opening ratio of the module.
- The embodiment of the present invention further provides a drive method for a touch display circuit, which is based on the touch display drive circuit and comprises:
- the first stage: the data writing unit writes a data signal into the drive compensation unit under the control of a signal input from the first scanning line, simultaneously under the control of a signal input from the second scanning line, the signal input unit inputs the data signal to the touch sensing unit, and the reading line receives an initial signal;
- the second stage: the drive compensation unit compensates the threshold voltage of the drive unit under the control of the signal input from the first scanning line,
- simultaneously the touch sensing unit detects a touch signal, and the reading line receives the touch signal;
- the third stage: the voltage stabilizing unit stabilizes the voltage of the drive compensation unit under the action of a control signal input from the control line, and at this moment, the touch sensing unit is in a standstill state; and the fourth stage: the light emitting control unit is controlled to be turned on by a signal input from the second scanning line, the light emitting unit emits light under the control of the light emitting control unit and the drive unit, and at this moment, the touch sensing unit is in a standstill state.
- Optionally, The first stage specifically is: the sixth switch is turned on and writes a data signal into the second capacitor to charge the second capacitor under the control of a signal input from the first scanning line, the first switch is turned on and inputs the data signal to the first capacity to charge the first capacity under the control of a signal input from the second scanning line, the second switch and the third switch are turned on, and the reading line receives an initial signal.
- The second stage specifically is: the fifth switch and the seventh switch are turned on, and the second capacitor discharges and compensates the threshold voltage of the drive transistor under the control of the signal input from the first scanning line, simultaneously the touch sensing unit detects a touch signal, and the reading line receives the touch signal.
- The third stage specifically is: the eighth switch stabilizes the voltage of the third capacitor under the action of a control signal input from the control line, and at this moment, the touch sensing unit is in a standstill state.
- The fourth stage specifically is: the fourth switch is controlled to be turned on by the signal input from the second scanning line, the light emitting unit emits light under the control of the fourth switch and the drive transistor, and at this moment, the touch sensing unit is in a standstill state.
- According to the touch display drive method provided by the embodiment, the method is based on a touch display drive circuit comprising a touch module and a display drive module, wherein the display drive module, under the control of signals input from the data line, the first scanning line and the second scanning line, is used for compensating a drive unit, writing a data signal input from the data line, outputting the data signal to the touch module simultaneously, and then driving light emitting unit to emit light; the touch module is used for receiving the data signal input from the display drive module under the action of the signals input from the first scanning line and the second scanning line so as to reset the touch module; when touch occurs, the touch module provides a touch signal, and the reading line receives the touch signal. This may reduce production processes of touch display products during production, save cost, and simultaneously increase aperture opening ratio of the products, thus increasing additional value.
- It will be understood that the foregoing embodiments are merely exemplary embodiments used for illustrating the principles of the present invention, however, the present invention is not limited thereto and is solely defined by the appended claims.
Claims (5)
- A touch display drive circuit, comprising: a touch module and a display drive module which comprises a drive unit and a light emitting unit (D1), wherein
the display drive module is connected with a data line, a first scanning line, a second scanning line, a control line, a first voltage source, a third voltage source and a fourth voltage source,
and the display drive module, under the control of signals input from the first scanning line and the second scanning line, is configured for compensating the drive unit, writing a data signal input from the data line, outputting the data signal to the touch module, and then driving the light emitting unit to emit light; and
the touch module is connected with the first scanning line, the second scanning line, a reading line and a second voltage source,
and the touch module, under the control of signals input from the data line, the first scanning line and the second scanning line, is configured for receiving the data signal from the display drive module, so as to reset a touch electrode (D) of the touch module,
wherein the touch module is adapted to detect a touch signal applied to the touch electrode (D) and provide the detected touch signal to the reading line, wherein
the display drive module further comprises: a data writing unit, a drive compensation unit, a voltage stabilizing unit and a light emitting control unit;
the data writing unit is configured for writing a data voltage provided by the data line into the drive compensation unit in response to a signal input from the first scanning line;
the voltage stabilizing unit is configured for stabilizing a voltage of the drive compensation unit in response to a control signal input from the control line;
the drive compensation unit is configured for performing discharge compensation of a threshold voltage of the drive unit in response to a signal input from the first scanning line; and
the light emitting unit (D1) is configured for emitting light according to an output of the drive unit and the light emitting control unit,
wherein the data writing unit comprises a sixth switch (T6), the drive compensation unit comprises a second capacitor (C2), a fifth switch (T5) and an eighth switch (T8), the drive unit comprises a drive transistor (T9), the voltage stabilizing unit comprises a seventh switch (T7), the light emitting control unit comprises a fourth switch (T4), and the light emitting unit comprises a light emitting diode,
a gate electrode of the fourth switch (T4) is connected with the second scanning line, a first electrode of the fourth switch (T4) is connected with a second electrode of the eighth switch (T8) and the first voltage source, and a second electrode of the fourth switch (T4) is connected with a second electrode of the fifth switch (T5) and a first electrode of the drive transistor (T9);
a gate electrode of the fifth switch (T5) is connected with a gate electrode of the sixth switch (T6) and the first scanning line, a first electrode of the fifth switch (T5) is connected with a first end of the second capacitor (C2) and a gate electrode of the drive transistor (T9), and a second electrode of the fifth switch (T5) is connected with the first electrode of the drive transistor (T9);
the gate electrode of the sixth switch (T6) is connected with the first scanning line, a first electrode of the sixth switch (T6) is connected with the data line, and a second electrode of the sixth switch (T6) is connected with a first electrode of the eighth switch (T8), the second end of the second capacitor (C2) and a first electrode of a first switch (T1);
a gate electrode of the seventh switch (T7) is connected with the first scanning line and a gate electrode of a third switch (T3), a first electrode of the seventh switch (T7) is connected with a second electrode of the drive transistor (T9) and the light emitting unit, and a second electrode of the seventh switch (T7) is connected with the third voltage source;
a gate electrode of the eighth switch (T8) is connected with the control line, the first electrode of the eighth switch (T8) is connected with the second end of the second capacitor (C2) and the first electrode of the first switch (T1), and the second electrode of the eighth switch (T8) is connected with the first voltage source; and
the gate electrode of the drive transistor (T9) is connected with the first end of the second capacitor (C2), and the second electrode of the drive transistor (T9) is connected with a first terminal of the light emitting unit and a second terminal of the light emitting unit is connected to a ground reference voltage level, wherein
the touch module comprises:a signal input unit and a touch sensing unit connected with the signal input unit,the signal input unit is configured for writing a voltage signal input from the data line into the touch sensing unit in response to a signal input from the second scanning line;the touch sensing unit is configured for providing a touch signal for the reading line when touch occurs on the touch electrode (D), whereinthe signal input unit comprises the first switch (T1), and the touch sensing unit comprises a first capacitor (C1), a second switch (T2) and the third switch (T3);a gate electrode of the first switch (T1) is connected with the second scanning line, the first electrode of the first switch (T1) is connected with the second electrode of the sixth switch (T6), and a second electrode of the first switch (T1) is connected with the touch electrode (D);a gate electrode of the second switch (T2) is connected with the touch electrode (D), a first electrode of the second switch (T2) is connected with a first electrode of the third switch (T3), and a second electrode of the second switch (T2) is connected with a second end of the first capacitor (C1) and the second voltage source;the gate electrode of the third switch (T3) is connected with the first scanning line, and a second electrode of the third switch (T3) is connected with the reading line; anda first end of the first capacitor (C1) is connected with the second electrode of the first switch (T1) and the gate electrode of the second switch (T2), and the second end of the first capacitor (C1) is connected with the second voltage source; whereinthe second voltage source and the third voltage source are connected to a ground reference voltage level. - The touch display drive circuit of claim 1, wherein the first switch (T1), the second switch (T2), the third switch (T3), the fourth switch (T4), the fifth switch (T5), the sixth switch (T6), the seventh switch (T7), the eighth switch (T8) and the drive transistor (T9) are N-type thin film transistors, and the second switch (T2) is an amplifying transistor.
- A display device, comprising the touch display drive circuit of any one of claims 1-2.
- A method of driving for the touch display circuit of claim 1, wherein the touch display drive method comprises:a first stage wherein the data writing unit writes a data signal into the drive compensation unit in response to a signal input from the first scanning line, the signal input unit inputs the data signal to the touch sensing unit in response to a signal input from the second scanning line so that the reading line receives an initial signal;a second stage wherein the drive compensation unit compensates a threshold voltage of the drive unit in response to a signal input from the first scanning line, while simultaneously the touch sensing unit detects a touch signal, so that the reading line receives the touch signal;a third stage wherein the voltage stabilizing unit stabilizes a voltage of the drive compensation unit in response to a control signal input from the control line while the touch sensing unit is in a standstill state, that is, a state in which all the devices of the touch sensing unit do not work ; anda fourth stage wherein the light emitting control unit is controlled to be turned on by a signal input from the second scanning line, the light emitting unit emits light under the control of the light emitting control unit and the drive unit while the touch sensing unit is set in the standstill state, whereinduring the first stage the sixth switch (T6) is turned on to write the data signal into the second capacitor (C2) to charge the second capacitor (C2) in response to the signal input from the first scanning line, the first switch (T1) is turned on to input the data signal to the first capacitor (C1) to charge the first capacitor (C1) under the control of the signal input from the second scanning line, the second switch (T2) and the third switch (T3) are turned on, so that the reading line receives the initial signal;during the second stage, the fifth switch (T5) and the seventh switch (T7) are turned on, and the second capacitor (C2) discharges and compensates the threshold voltage of the drive transistor (T9) under the control of the signal input from the first scanning line, while simultaneously the touch sensing unit detects the touch signal, so that the reading line receives the touch signal;during the third stage, the eighth switch (T8) stabilizes the voltage of the drive compensation unit in response to the control signal input from the control line while the touch sensing unit is set in the standstill state; andduring the fourth stage, the fourth switch (T4) is controlled to be turned on by the signal input from the second scanning line, the light emitting unit emits light under the control of the fourth switch (T4) and the drive transistor (T9) while the touch sensing unit is set in the standstill state, wherein,during the third stage, the first scanning line is applied with a first level voltage, the second scanning line is applied with the first level voltage, the control line is applied with a second level voltage which is higher than the first level voltage, and the data line is applied with the second level voltage, so that the first switch (T1), the second switch (T2), the third switch (T3), the fourth switch (T4), the fifth switch (T5), the sixth switch (T6), and the seventh switch (T7) are turned off, and the eighth switch (T8) is turned on.
- The touch display drive method of claim 4, wherein the first switch (T1), the second switch (T2), the third switch (T3), the fourth switch (T4), the fifth switch (T5), the sixth switch (T6), the seventh switch (T7), the eighth switch (T8) and the drive transistor (T9) are N-type thin film transistors, and the second switch (T2) is an amplifying transistor.
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CN201310375517.4A CN103456267B (en) | 2013-08-26 | 2013-08-26 | Touch-control display driver circuit and driving method thereof and display device |
PCT/CN2013/089675 WO2015027631A1 (en) | 2013-08-26 | 2013-12-17 | Touch control display driving circuit, driving method thereof and display device |
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EP (1) | EP2887344B1 (en) |
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US9880654B2 (en) | 2018-01-30 |
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US20160246424A1 (en) | 2016-08-25 |
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CN103456267A (en) | 2013-12-18 |
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